My digital gold seller has stopped servicing my account. Can you transfer my account to another partner of yours? What is the process

An error occurred while processing the template.
The following has evaluated to null or missing:
==> testimonial  [in template "20099#20125#null" at line 9, column 107]

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Tip: If the failing expression is known to legally refer to something that's sometimes null or missing, either specify a default value like myOptionalVar!myDefault, or use <#if myOptionalVar??>when-present<#else>when-missing</#if>. (These only cover the last step of the expression; to cover the whole expression, use parenthesis: (myOptionalVar.foo)!myDefault, (myOptionalVar.foo)??
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FTL stack trace ("~" means nesting-related):
	- Failed at: #assign testimonial_date_Data = gette...  [in template "20099#20125#null" at line 9, column 53]
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1<dl><dt class="text-capitalize">Question</dt><dd><#if (question.getData())??> 
2	${question.getData()} 
3</#if></dd><dt class="text-capitalize">Answer</dt><dd><#if (answer.getData())??> 
4	${answer.getData()} 
5</#if></dd><dt class="text-capitalize">Media</dt><dd><a href="${media.getData()}"> 
6	${languageUtil.format(locale, "download-x", "Media", false)} 
7</a></dd><dt class="text-capitalize">Name</dt><dd><#if (testimonial.name.getData())??> 
8	${testimonial.name.getData()} 
9</#if></dd><dt class="text-capitalize">Date</dt><dd><#assign testimonial_date_Data = getterUtil.getString(testimonial.date.getData())> 
10 
11<#if validator.isNotNull(testimonial_date_Data)> 
12	<#assign testimonial_date_DateObj = dateUtil.parseDate("yyyy-MM-dd", testimonial_date_Data, locale)> 
13 
14	${dateUtil.getDate(testimonial_date_DateObj, "dd MMM yyyy - HH:mm:ss", locale)} 
15</#if></dd><dt class="text-capitalize">Description</dt><dd><#if (testimonial.description.getData())??> 
16	${testimonial.description.getData()} 
17</#if></dd><dt class="text-capitalize">Profile</dt><dd><a href="${testimonial.profile.getData()}"> 
18	${languageUtil.format(locale, "download-x", "Profile", false)} 
19</a></dd></dl>